diff --git a/mps-interpreter/src/interpretor.rs b/mps-interpreter/src/interpretor.rs
index c4c3166..c1732c5 100644
--- a/mps-interpreter/src/interpretor.rs
+++ b/mps-interpreter/src/interpretor.rs
@@ -162,9 +162,9 @@ pub(crate) fn standard_vocab(vocabulary: &mut MpsLanguageDictionary) {
         // sorters
         .add(crate::lang::vocabulary::sorters::empty_sort())
         .add(crate::lang::vocabulary::sorters::shuffle_sort()) // accepts ~(shuffle)
-        .add(crate::lang::vocabulary::sorters::field_sort()) // accepts any ~(something)
         .add(crate::lang::vocabulary::sorters::bliss_sort())
         .add(crate::lang::vocabulary::sorters::bliss_next_sort())
+        .add(crate::lang::vocabulary::sorters::field_sort()) // accepts any ~(something)
         // iter blocks
         .add(
             crate::lang::MpsItemBlockFactory::new()
diff --git a/mps-interpreter/src/lang/vocabulary/filters/field_filter.rs b/mps-interpreter/src/lang/vocabulary/filters/field_filter.rs
index 0572001..a3c3bea 100644
--- a/mps-interpreter/src/lang/vocabulary/filters/field_filter.rs
+++ b/mps-interpreter/src/lang/vocabulary/filters/field_filter.rs
@@ -2,7 +2,7 @@ use std::collections::VecDeque;
 use std::fmt::{Debug, Display, Error, Formatter};
 
 use super::utility::{assert_comparison_operator, comparison_op};
-use crate::lang::utility::{assert_token, assert_type, check_is_type, assert_empty};
+use crate::lang::utility::{assert_token, assert_type, check_is_type};
 use crate::lang::MpsLanguageDictionary;
 use crate::lang::MpsTypePrimitive;
 use crate::lang::{MpsFilterFactory, MpsFilterPredicate, MpsFilterStatementFactory};
@@ -104,16 +104,15 @@ pub struct FieldFilterFactory;
 impl MpsFilterFactory<FieldFilter> for FieldFilterFactory {
     fn is_filter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
         let tokens_len = tokens.len();
-        (tokens_len >= 3
+        (tokens_len >= 2
             // field > variable OR field < variable
             && tokens[0].is_name()
-            && (tokens[1].is_open_angle_bracket() || tokens[1].is_close_angle_bracket())
-            && (tokens[2].is_name() || check_is_type(tokens[2])))
-            || (tokens_len >= 4 // field >= variable OR field <= variable OR field != variable
+            && (tokens[1].is_open_angle_bracket() || tokens[1].is_close_angle_bracket()))
+            || (tokens_len >= 3 // field >= variable OR field <= variable OR field != variable
             && tokens[0].is_name()
             && (tokens[1].is_open_angle_bracket() || tokens[1].is_close_angle_bracket() || tokens[1].is_equals() || tokens[1].is_exclamation())
             && tokens[2].is_equals()
-            && (tokens[3].is_name() || check_is_type(tokens[3])))
+            && !(tokens_len > 3 && tokens[3].is_equals()))
     }
 
     fn build_filter(
@@ -132,7 +131,7 @@ impl MpsFilterFactory<FieldFilter> for FieldFilterFactory {
         let compare_operator = assert_comparison_operator(tokens)?;
         if check_is_type(&tokens[0]) {
             let value = VariableOrValue::Value(assert_type(tokens)?);
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldFilter {
                 field_name: field,
                 field_errors: FieldFilterErrorHandling::Error,
@@ -149,7 +148,7 @@ impl MpsFilterFactory<FieldFilter> for FieldFilterFactory {
                 MpsToken::Name("variable_name".into()),
                 tokens,
             )?);
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldFilter {
                 field_name: field,
                 field_errors: FieldFilterErrorHandling::Error,
diff --git a/mps-interpreter/src/lang/vocabulary/filters/field_filter_maybe.rs b/mps-interpreter/src/lang/vocabulary/filters/field_filter_maybe.rs
index 0202a5f..622057a 100644
--- a/mps-interpreter/src/lang/vocabulary/filters/field_filter_maybe.rs
+++ b/mps-interpreter/src/lang/vocabulary/filters/field_filter_maybe.rs
@@ -2,7 +2,7 @@ use std::collections::VecDeque;
 
 use super::utility::assert_comparison_operator;
 use super::{field_filter::VariableOrValue, FieldFilter, FieldFilterErrorHandling};
-use crate::lang::utility::{assert_token, assert_token_raw, assert_type, check_is_type, assert_empty};
+use crate::lang::utility::{assert_token, assert_token_raw, assert_type, check_is_type};
 use crate::lang::MpsLanguageDictionary;
 use crate::lang::SyntaxError;
 use crate::lang::{MpsFilterFactory, MpsFilterStatementFactory};
@@ -13,17 +13,15 @@ pub struct FieldFilterMaybeFactory;
 impl MpsFilterFactory<FieldFilter> for FieldFilterMaybeFactory {
     fn is_filter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
         let tokens_len = tokens.len();
-        (tokens_len >= 4 // field > variable OR field < variable
+        (tokens_len >= 3 // field > variable OR field < variable
             && tokens[0].is_name()
             && (tokens[1].is_interrogation() || tokens[1].is_exclamation())
-            && (tokens[2].is_open_angle_bracket() || tokens[2].is_close_angle_bracket())
-            && (tokens[3].is_name() || check_is_type(tokens[3])))
-            || (tokens_len >= 5 // field >= variable OR field <= variable OR field != variable
+            && (tokens[2].is_open_angle_bracket() || tokens[2].is_close_angle_bracket()))
+            || (tokens_len >= 4 // field >= variable OR field <= variable OR field != variable
             && tokens[0].is_name()
             && (tokens[1].is_interrogation() || tokens[1].is_exclamation())
             && (tokens[2].is_open_angle_bracket() || tokens[2].is_close_angle_bracket() || tokens[2].is_equals() || tokens[2].is_exclamation())
-            && tokens[3].is_equals()
-            && (tokens[4].is_name() || check_is_type(tokens[4])))
+            && tokens[3].is_equals())
     }
 
     fn build_filter(
@@ -53,7 +51,7 @@ impl MpsFilterFactory<FieldFilter> for FieldFilterMaybeFactory {
         let compare_operator = assert_comparison_operator(tokens)?;
         if check_is_type(&tokens[0]) {
             let value = VariableOrValue::Value(assert_type(tokens)?);
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldFilter {
                 field_name: field,
                 field_errors: error_f,
@@ -70,7 +68,7 @@ impl MpsFilterFactory<FieldFilter> for FieldFilterMaybeFactory {
                 MpsToken::Name("variable_name".into()),
                 tokens,
             )?);
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldFilter {
                 field_name: field,
                 field_errors: error_f,
diff --git a/mps-interpreter/src/lang/vocabulary/filters/field_like_filter.rs b/mps-interpreter/src/lang/vocabulary/filters/field_like_filter.rs
index 749468b..d40d4f6 100644
--- a/mps-interpreter/src/lang/vocabulary/filters/field_like_filter.rs
+++ b/mps-interpreter/src/lang/vocabulary/filters/field_like_filter.rs
@@ -2,7 +2,7 @@ use std::collections::VecDeque;
 use std::fmt::{Debug, Display, Error, Formatter};
 
 use super::field_filter::{FieldFilterErrorHandling, VariableOrValue};
-use crate::lang::utility::{assert_name, assert_token, assert_token_raw, check_name, assert_empty};
+use crate::lang::utility::{assert_name, assert_token, assert_token_raw, check_name};
 use crate::lang::MpsLanguageDictionary;
 use crate::lang::MpsTypePrimitive;
 use crate::lang::{MpsFilterFactory, MpsFilterPredicate, MpsFilterStatementFactory};
@@ -72,15 +72,13 @@ pub struct FieldLikeFilterFactory;
 impl MpsFilterFactory<FieldLikeFilter> for FieldLikeFilterFactory {
     fn is_filter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
         let tokens_len = tokens.len();
-        (tokens_len >= 3 // field like variable
+        (tokens_len >= 2 // field like variable
             && tokens[0].is_name()
-            && check_name("like", tokens[1])
-            && (tokens[2].is_name() || tokens[2].is_literal()))
-            || (tokens_len >= 4 // field? like variable OR field! like variable
+            && check_name("like", tokens[1]))
+            || (tokens_len >= 3 // field? like variable OR field! like variable
             && tokens[0].is_name()
             && (tokens[1].is_interrogation() || tokens[1].is_exclamation())
-            && check_name("like", tokens[2])
-            && (tokens[3].is_name() || tokens[3].is_literal()))
+            && check_name("like", tokens[2]))
     }
 
     fn build_filter(
@@ -116,7 +114,7 @@ impl MpsFilterFactory<FieldLikeFilter> for FieldLikeFilterFactory {
                 tokens,
             )?;
             let value = VariableOrValue::Value(MpsTypePrimitive::String(literal));
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldLikeFilter {
                 field_name: field,
                 field_errors: error_handling,
@@ -131,7 +129,7 @@ impl MpsFilterFactory<FieldLikeFilter> for FieldLikeFilterFactory {
                 MpsToken::Name("variable_name".into()),
                 tokens,
             )?);
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldLikeFilter {
                 field_name: field,
                 field_errors: FieldFilterErrorHandling::Error,
diff --git a/mps-interpreter/src/lang/vocabulary/filters/field_match_filter.rs b/mps-interpreter/src/lang/vocabulary/filters/field_match_filter.rs
index 82032a2..ff32faa 100644
--- a/mps-interpreter/src/lang/vocabulary/filters/field_match_filter.rs
+++ b/mps-interpreter/src/lang/vocabulary/filters/field_match_filter.rs
@@ -4,7 +4,7 @@ use std::fmt::{Debug, Display, Error, Formatter};
 use regex::Regex;
 
 use super::field_filter::{FieldFilterErrorHandling, VariableOrValue};
-use crate::lang::utility::{assert_name, assert_token, assert_token_raw, check_name, assert_empty};
+use crate::lang::utility::{assert_name, assert_token, assert_token_raw, check_name};
 use crate::lang::MpsLanguageDictionary;
 use crate::lang::MpsTypePrimitive;
 use crate::lang::{MpsFilterFactory, MpsFilterPredicate, MpsFilterStatementFactory};
@@ -83,15 +83,13 @@ pub struct FieldRegexFilterFactory;
 impl MpsFilterFactory<FieldRegexFilter> for FieldRegexFilterFactory {
     fn is_filter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
         let tokens_len = tokens.len();
-        (tokens_len >= 3 // field like variable
+        (tokens_len >= 2 // field like variable
             && tokens[0].is_name()
-            && check_name("matches", tokens[1])
-            && (tokens[2].is_name() || tokens[2].is_literal()))
-            || (tokens_len >= 4 // field? like variable OR field! like variable
+            && check_name("matches", tokens[1]))
+            || (tokens_len >= 3 // field? like variable OR field! like variable
             && tokens[0].is_name()
             && (tokens[1].is_interrogation() || tokens[1].is_exclamation())
-            && check_name("matches", tokens[2])
-            && (tokens[3].is_name() || tokens[3].is_literal()))
+            && check_name("matches", tokens[2]))
     }
 
     fn build_filter(
@@ -133,7 +131,7 @@ impl MpsFilterFactory<FieldRegexFilter> for FieldRegexFilterFactory {
             })?;
             let compiled_cache = (literal.clone(), regex_c);
             let value = VariableOrValue::Value(MpsTypePrimitive::String(literal));
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldRegexFilter {
                 field_name: field,
                 field_errors: error_handling,
@@ -149,7 +147,7 @@ impl MpsFilterFactory<FieldRegexFilter> for FieldRegexFilterFactory {
                 MpsToken::Name("variable_name".into()),
                 tokens,
             )?);
-            assert_empty(tokens)?;
+            //assert_empty(tokens)?;
             Ok(FieldRegexFilter {
                 field_name: field,
                 field_errors: FieldFilterErrorHandling::Error,
diff --git a/mps-interpreter/src/lang/vocabulary/filters/range_filter.rs b/mps-interpreter/src/lang/vocabulary/filters/range_filter.rs
index 28e229b..2ba8353 100644
--- a/mps-interpreter/src/lang/vocabulary/filters/range_filter.rs
+++ b/mps-interpreter/src/lang/vocabulary/filters/range_filter.rs
@@ -101,40 +101,12 @@ pub struct RangeFilterFactory;
 
 impl MpsFilterFactory<RangeFilter> for RangeFilterFactory {
     fn is_filter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
-        (
-            // ..
-            tokens.len() == 2 && tokens[0].is_dot() && tokens[1].is_dot()
-        ) || (tokens.len() == 3
-            && ((
-                // ..number
-                tokens[0].is_dot() && tokens[1].is_dot() && Lookup::check_is(tokens[2])
-            ) || (
-                // number..
-                Lookup::check_is(tokens[0]) && tokens[1].is_dot() && tokens[2].is_dot()
-            )))
-            || (tokens.len() == 4
-                && ((
-                    // number..number
-                    Lookup::check_is(tokens[0])
-                        && tokens[1].is_dot()
-                        && tokens[2].is_dot()
-                        && Lookup::check_is(tokens[3])
-                ) || (
-                    // ..=number
-                    tokens[0].is_dot()
-                        && tokens[1].is_dot()
-                        && tokens[2].is_equals()
-                        && Lookup::check_is(tokens[3])
-                )))
-            || (
-                // number..=number
-                tokens.len() == 5
+        tokens.len() >= 2
+            && ((tokens.len() >= 2 && tokens[0].is_dot() && tokens[1].is_dot())
+                || (tokens.len() >= 3
                     && Lookup::check_is(tokens[0])
                     && tokens[1].is_dot()
-                    && tokens[2].is_dot()
-                    && tokens[3].is_equals()
-                    && Lookup::check_is(tokens[4])
-            )
+                    && tokens[2].is_dot()))
     }
 
     fn build_filter(
diff --git a/mps-interpreter/src/lang/vocabulary/filters/unique.rs b/mps-interpreter/src/lang/vocabulary/filters/unique.rs
index 3e3ea23..da7ca3b 100644
--- a/mps-interpreter/src/lang/vocabulary/filters/unique.rs
+++ b/mps-interpreter/src/lang/vocabulary/filters/unique.rs
@@ -90,9 +90,7 @@ pub struct UniqueFilterFactory;
 
 impl MpsFilterFactory<UniqueFieldFilter> for UniqueFilterFactory {
     fn is_filter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
-        (tokens.len() == 2 || tokens.len() == 3)
-            && check_name("unique", &tokens[0])
-            && tokens[1].is_name()
+        tokens.len() >= 2 && check_name("unique", &tokens[0])
     }
 
     fn build_filter(
diff --git a/mps-interpreter/src/lang/vocabulary/sorters/bliss_next_sorter.rs b/mps-interpreter/src/lang/vocabulary/sorters/bliss_next_sorter.rs
index b21e107..5d046f6 100644
--- a/mps-interpreter/src/lang/vocabulary/sorters/bliss_next_sorter.rs
+++ b/mps-interpreter/src/lang/vocabulary/sorters/bliss_next_sorter.rs
@@ -147,9 +147,7 @@ pub struct BlissNextSorterFactory;
 
 impl MpsSorterFactory<BlissNextSorter> for BlissNextSorterFactory {
     fn is_sorter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
-        tokens.len() == 2
-            && check_name("advanced", tokens[0])
-            && check_name("bliss_next", tokens[1])
+        tokens.len() > 1 && check_name("advanced", tokens[0]) && check_name("bliss_next", tokens[1])
     }
 
     fn build_sorter(
diff --git a/mps-interpreter/src/lang/vocabulary/sorters/bliss_sorter.rs b/mps-interpreter/src/lang/vocabulary/sorters/bliss_sorter.rs
index 4495f0e..13307f4 100644
--- a/mps-interpreter/src/lang/vocabulary/sorters/bliss_sorter.rs
+++ b/mps-interpreter/src/lang/vocabulary/sorters/bliss_sorter.rs
@@ -141,7 +141,7 @@ pub struct BlissSorterFactory;
 
 impl MpsSorterFactory<BlissSorter> for BlissSorterFactory {
     fn is_sorter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
-        tokens.len() == 2
+        tokens.len() > 1
             && check_name("advanced", tokens[0])
             && check_name("bliss_first", tokens[1])
     }
diff --git a/mps-interpreter/src/lang/vocabulary/sorters/field_sorter.rs b/mps-interpreter/src/lang/vocabulary/sorters/field_sorter.rs
index 1b239a6..3a0f510 100644
--- a/mps-interpreter/src/lang/vocabulary/sorters/field_sorter.rs
+++ b/mps-interpreter/src/lang/vocabulary/sorters/field_sorter.rs
@@ -60,7 +60,7 @@ pub struct FieldSorterFactory;
 
 impl MpsSorterFactory<FieldSorter> for FieldSorterFactory {
     fn is_sorter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
-        tokens.len() == 1 && tokens[0].is_name()
+        !tokens.is_empty() && tokens[0].is_name()
     }
 
     fn build_sorter(
diff --git a/mps-interpreter/src/lang/vocabulary/sorters/shuffle.rs b/mps-interpreter/src/lang/vocabulary/sorters/shuffle.rs
index 0e0c235..3afbf9a 100644
--- a/mps-interpreter/src/lang/vocabulary/sorters/shuffle.rs
+++ b/mps-interpreter/src/lang/vocabulary/sorters/shuffle.rs
@@ -71,8 +71,8 @@ pub struct ShuffleSorterFactory;
 
 impl MpsSorterFactory<ShuffleSorter> for ShuffleSorterFactory {
     fn is_sorter(&self, tokens: &VecDeque<&MpsToken>) -> bool {
-        (tokens.len() == 1 && check_name("shuffle", &tokens[0]))
-            || (tokens.len() == 2
+        (!tokens.is_empty() && check_name("shuffle", &tokens[0]))
+            || (tokens.len() > 1
                 && check_name("random", &tokens[0])
                 && check_name("shuffle", &tokens[1]))
     }